Thermal testing device



Sept. 25, 1934. C K ROQS 1,975,052

THERMAL TESTING DEVICE Filed Nov. 10. 1932 wmlllllm III IlllIIl 26 21 INVENTOR CAR LISLE K. R005.

A'I'TORNE? Patented Sept. 25, 1934 STATES PATENT orrrc THERMAL TESTING DEVICE ilipplication November It), 1932, Serial No. 641,993

6 Elaims.

This invention relates to testing methods and devices, and has reference more particularly to thermal testing devices for demonstrating the transmission of heat through surfaces coated with various materials.

It has been discovered that surfaces coated with bright metallic layers transmit much less heat than surfaces coated with dull or dull black coatings. It is desirable to provide a testing de- Mi vice which will demonstrate this fact to persons in an eifective and conclusive manner.

An object of this invention, therefore, is to provide a testing device for demonstrating the transmission of heat through sheets of material coated with a variety of coatings.

Another object of this invention is to provide a thermal testing device in which sheets of material coated in various ways may be simultaneously tested from a common source of heat; also to improve testing devices in other respects hereinafter specified and claimed.

Reference is to be had to the accompanying drawing forminga part of this specification, in which Fig. 1 is a perspective view of my improved thermal testing box,

Fig. 2 is a perspective view showing the other side of the testing box with an electric lamp in position as a source of heat,

Fig. 3 is a sectional plan view through the testing device taken on line 3-3 of Fig. 1,

Fig. 4 is a plan view of the testing box unfolded in fiat position, and

Fig. 5 is a view of the test box folded up for insertion in a shipping envelope.

My thermal testing device is primarily intended as an advertising medium for demonstrating to the public the effectiveness of the metallic coating on a wallboard panel in improving the heat insulating value of said panel. While the testing devices may take a variety of forms and shapes, they are preferably constructed in the form of the cubical box having a top wall 10, side walls 11, 12, 13, and 1e, anda bottom wall 15. For convenience in manufactureand shipment, I prefer to make the test box of foldable cardboard of a shape when fully expanded-as shown in Fig. 4. Prior to shipment, an integral flap 16 on the side wall 13 is adhesively attached assembling and before shipment. When the to the edge of sidewall 12. The carton is folded carton is in the form as shown in Fig. 5, a small paper envelope 19 containing a parafiin or other candle 20, is adhesively attached to the flap 18. The side walls 11 and 13 are provided with integral flaps 21, which serve to reinforce the top and bottom edges of the side walls, and extend inwardly into the interior of the box.

The inside surfaces of the side walls 11 and 13 are coated with dull black paint and metal foil, respectively, while the inside surface of the side wall 12 is left blank. Numbers or other designating indicia 23 are printed on the outside surfaces of the side walls 11, 12, and 13, for the purpose of indicating the heat emissivity value of the respective side walls. An aperture 24 is provided in the top wall 10 for the purpose of allowing the insertion of an electric lamp 25 through said aperture to extend into the inside of said box and supply a source of heat common to all of the side walls of the box. A comparatively large aperture 26 is provided in the side wall 14. so that the inside of the box can be observedby a person during the testing procedure. In the outside center of each. of the side walls 11, 12, and 13, there is printed one or more annular colored bands 28, which serve to locate a central area 29 at the center of the side wall surface.

In operating the test device, the pasteboard carton is removed from its shipping envelope and assembled, the candle envelope 19 preferably be- 5' ing removed from the flap 18 prior to assembling. A 560 or 100 watt electric lamp is next inserted in the box with the base of the bulb extending upwardly through the aperture 24, and screwed into a suitable electric light socket which may be suspended from a cord or electric fixture of any suitable type. The small candle 20 is removed from the envelope l9, lighted, a drop or spot of wax is deposited from the lighted candle on each of the three areas 29. The electric lamp is now lighted and with a watch, the length of time necessary to melt the wax on each of the three sides 1, 2 and 3, is noted. It will be found that the spot on side wall No. 1, having the black surface, will melt first, the wax on side wall No. 2, having a bare cardboardinner surface, will melt second, and the wax on side No. 3, coated on the inside i. with the metal foil, will remain firm and unfused long after the other two are melted. The box may be used over again several times for the same test.

It will be understood that the type of test apparatus can be varied considerably, without departing from the spirit of the invention as defined in the appended claims. The box may be made of rigid material such as pressboard, and can be shipped to the users in assembled condition.- Any source of heat may be used inside ofthe test box instead; of the electric lamp, such as a. gas flame. The-use ofv the fusible wax can be omitted and yet the vast difference in tempera! ture between the outer surfaces of the respective side walls is readily apparent to the hand of the operator.

Having thus described my invention, I claim as new and desire to secure by Letters Patent;-- 1.- -.A thermal testing device comprising a plurality of sheets, each bearing an inside surface coating varying in character from sheet to sheet, the surfaces of respective sheets opposite said coatings being adapted to receive a fusible material, said sheets being so arranged as to expose said coated surfaces to an inside common source of heat which fuses said fusible material at varying rates depending on the character of coatings.

2. A thermal testing device comprising a cardboard box enclosing a source of heat and having a black surface coating and a metal foil surface coating on the inside surfaces of the side walls of said box, and a fusible material on the outside surfaces of said coated side walls which will be fused at varying periods by transmission of heat through said coated side walls depending on the type of surface coating.

3. A thermal testing device comprising defined areas of bright material and dark material contiguousto a common source of heat spaced equally' fusible material adhering to said materials to be fused by heat transmitted through said surfaces.

4. A. foidable cardboard box adapted to be assembled to form a plurality of side walls, one

of said side walls being provided with an aperture for receiving an electric lamp as a source of heat inside said box, the inside surfaces of a plurality of side walls being provided with coatings of different heat emissivity value, and bodies of fusible material on the outside of said side walls opposite said coatinga 1 1 -5. A foldable cardboard box adapted to be assembled to form a plurality of side walls, one of said side walls being provided with an aperture for receiving an electric lamp as a source of heat inside said box, another of said side walls being provided with an observation aperture, other of said walls being provided with inside coatings of different heat emissivity value, designs on the outside surfacesof said side walls opposite said coatings designating limited areas, and fusible material on said areas. v

6. A thermal testing device comprising a cubical box, means for suspending said box from the upper of said walls, a source. of heat within said box, coatings of different heat emissivity value on the inside surfaces of .a plurality of side walls of said box, and a fusible material on the outside surfaces of said coated side walls adapted to be fused by heat transmitted through said coated side walls.

CARL-ISLE K. R008. 

